First time trying to install a plug-in...

Hi, I’m mostly familiar with blueprints and haven’t done much with C++ nor have I ever installed a plug-in to Unreal. I’m trying to install this plug-in: but I’m coming across problems. I’ve put the necessary Source folder and .uplugin files into my project, and added the following lines to my .build code in the project’s separate Source folder:

I’m pretty ignorant about coding, so I assume that’s where I’ve gone wrong. The project I’m building is using the 2D platformer template and I’ve added C++ by creating an empty class. The game is failing to compile. Can anyone help me out here?